Retrieving and displaying forms

The following link: https://api.drupal.org/api/drupal/core%21core.api.php/group/form_api/8.2.x says the following in part. Retrieving and displaying forms Drupal::formBuilder()->getForm() should be used to handle retrieving, processing, and displaying a rendered HTML form. Given the ExampleForm defined above, Drupal::formBuilder()->getForm(‘DrupalmymoduleFormExampleForm’) would return the rendered HTML of the form defined by ExampleForm::buildForm(), or[…]